The whole society is like that, inter-caste, inter-racial, inter-religious, inter-ethnic....all of them happen. It is a natural course of life. But then, there is no need to worry on the whole about the caste. I will tell you why?, In a natural mate selection, when it comes to animals, the female will chose the stronger one, like dogs, horses etc... In case of birds also, the female is the chooser, the baya weaver will only agree to mate after it inspects the nest the male has built, the insect like a dung beetle chooses whichever male makes the largest dung ball and interestingly the males race to the female which stands as the finishing line.
So, when women get empowered as in the present society, they get independent and do whatever they like. Mans position becomes a little brittle here, since unless he has money, a job, a own house, etc..etc... No modern Brahmin is offering his girl for marriage. Woman empowerment and Mad rush for the money are the causes. As far as love marriages are concerned, they too happen only as an effect of hormones (I would call it hormone madness). Mixing with others frequently destroys the hormone balance.
So, this man ends up marrying a Christian or Muslim or non-brahmin Hindu, whoever he can find. And there is this Papa samyam in horoscope match making, which is very difficult in finding the match, as the male horoscope should always have more Papa then a female. Whether Horoscope matching is right? Yes it is correct, but it should taken only to the best astrologer, who possess a bit of intuition on his own and not glib talkers whom we see in the TV and channels. In fact, I figured out that even without a horoscope, we can still make out one, if we correctly observe the face and the body, as each feature is represented by the Lagna and Rasi it is located. We have to locate the place and then form the chart. It is a bit tough, but it is still doable.
But there is good news here. When social conflicts happen, the water gets dirty and there is turmoil, after a period of time, the dirtiest particles settle in the bottom followed by small rocks and big rocks and all the dust settles down, revealing the pure water again. The process also happens in animals, the best form a class again and are called special names. To use a more recognisable analogy, When you mix Whisky with Soda and Water, and leave it for some time, the Whisky comes on the top, the Soda gets the middle and the water goes to the Bottom. When you open a can of monocrotophus or any other pesticide, the top most layer contains the most poison, the bottom is just a mixture, you have mix it again with water to spray. The mix of marriages is only a natural phenomenon, as Whisky with water and Dirty rainy water, settling down to fresh water, becoming sea water and coming back to us as pure distilled water from the sky. It happens throughout the world.